This Mustang belt tensioner is the same belt tensioner that's included in the 2010 ROUSHcharger kits, making it a replacement part for these packages:2010 Mustang R2300 ROUSHcharger & Upgrade; Kit (part #420026)2010 Mustang R2300 ROUSHcharger Upgrade Kit (part #420027)2010 Mustang Chrome ROUSHcharger (part #420024)This tensioner is specially designed for heavy duty applications to handle the added rotational forces on the FEAD from supercharging. This heavy-duty tensioner is an upgrade for all SINGLE BELT TVS R2300 ROUSH superchargers installed on 2005-2009 Mustang GTs. Mustang Belt Tensioner is a heavy duty replacement part for 2010 ROUSHcharger kits 2005-2010 Ford Mustang